One (1) robot vampire versus one (1) zombie dinosaur will result in a a tie. A vampire that feeds off of robots would have no interes in a zombie dinosaur. A zombie dinosaur would only have interest in living things. A vampire, being undead, registers on the zombie level of things, and everyone knows zombies don't eat zombies.

If the battle plays out long term, I bet that the zombie would win because the vampire would starve or be burned to death by sunlight before the zombie fell apart.